exam Maths Puzzle Numerical Ability

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If the sides of a square are decreased by 3cm, the area is decreased by 81cm^2.What were the dimensions of the original square?

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exam Other Question
Can you give me a detailed explanation why the line x=4 is a vertical line?

Thanks in advance
Sydoni Are the following lines parallel, perpendicular, or neither?
L1 with equation x – 6y = 12
L2 with equation 6x + y = 6